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At the time of the alleged murder, the accused told police her mother-in-law had been attacked by a group of men who had forced their way into their property after a road rage incident.

About three hours after the reported home invasion, she was found in the street by neighbours with her hands and face bound with tape.

But, in a previous bail application, Ms Matteo told Adelaide Magistrates Court it was the crown case that the story Nilsson had concocted was demonstrably false and the home invasion crime scene had been fabricated.

Ms Matteo said a forensic expert had analysed the dead woman's smart watch and had narrowed the time from when she was attacked to when she died to a seven-minute window.

She said the data showed a burst of heavy activity, consistent with the woman being the victim of an "ambush-type" attack followed by a period of less activity when she possibly lost consciousness.